Year, model number, total time airframe, engine model, total time prop,
time on engine since major, time on engine since top, List all avionics
by make and model. Overall condition. Engine compressions. Oil burn.
Paint condition. Upholstry condition. List any non-working items.
Ownership history. Where located.

No one can appraise it without seeing it and what it sells for is
another matter. Each sale is different.